Oh, that's easy! A pregnant wife would probably appreciate some practical gifts, like comfy pajamas, a good book, or some soothing bath products. But if you want to make her feel special, you could also get her something sentimental, like a photo album of her pregnancy or a charm bracelet with a charm for each month of the pregnancy. Either way, the most important thing is to show her how much you care and how excited you are for the new baby!